<template>
  <div class="goods">
    <div class="wrap">
      <Crumb> </Crumb>
      <img src="../assets/img/banner.4c6b6225.png" width="100%" alt="" />
      <ul class="options">
        <li>
          <strong>排序：</strong>
          <span
            :class="{ active: index1 == index }"
            v-for="(item, index) in options1"
            :key="index"
            @click="options1Fn(index, item.min, item.max)"
          >
            {{ item.txt }}
          </span>
        </li>
        <li>
          <strong>分类：</strong>
          <span
            :class="{ active: index2 == index }"
            v-for="(item, index) in options2"
            :key="index"
            @click="options2Fn(index, item.type)"
            >{{ item.txt }}</span
          >
        </li>
      </ul>
      <List :arr="goosNewList" />
      <div class="loadingIcon" v-show="isLoading">
        <i class="iconfont icon-loading rotateIcon"></i>
        loading...
      </div>
      <div class="loadingIcon" v-show="!isLoading">没有商品了...</div>
    </div>
  </div>
</template>                            
<script>
import Crumb from "../components/Crumb.vue";
import List from "../components/home/List.vue";
import { GoodsSearchAPI } from "@/request/api";
import { getClientHeight, getScrollTop, getScrollHeight } from "@/utils";
export default {
  data() {
    return {
      goodsList: [],
      goosNewList: [],
      // 接口参数
      did: 0,
      type: 0,
      min: 0,
      max: 100000,
      keyword: "",
      // 排序的数组项
      options1: [
        { min: 0, max: 0, txt: "全部" },
        // "我还可以兑换"的max值是Header组件的coin值
        { min: 0, max: 0, txt: "我还可以兑换" },
        { min: 0, max: 500, txt: "0-500分" },
        { min: 500, max: 1000, txt: "500-1000分" },
        { min: 1000, max: 1500, txt: "1000-1500分" },
        { min: 1500, max: 2500, txt: "1500-2500分" },
        { min: 2500, max: 6500, txt: "2500-6500分" },
        { min: 6500, max: 10000, txt: "6500-10000分" },
      ],
      // 分类数组项
      options2: [
        { type: 0, txt: "全部" },
        { type: 1, txt: "实体商品" },
        { type: 2, txt: "虚拟商品" },
      ],
      // 排序索引
      index1: 0,
      // 分类索引
      index2: 0,
      // 页数
      page: 1,
      // 每页个数
      size: 8,
      // 是否开始加载
      isLoading: false,
      // 是否到达底部
      isReachBottom: false,
    };
  },
  components: {
    Crumb,
    List,
  },
  created() {
    let keyword = this.$route.query.keyword;
    keyword ||= "";
    this.keyword = keyword;
    this.goodsSearch();
  },
  mounted() {
    // 监听滚动距离
    window.addEventListener("scroll", this.scrollFn);
  },
  beforeDestroy() {
    // 取消监听
    window.removeEventListener("scroll", this.scrollFn);
  },
  methods: {
    async goodsSearch() {
      let res = await GoodsSearchAPI({
        did: this.did,
        type: this.type,
        min: this.min,
        max: this.max,
        keyword: this.keyword,
      });
      this.goodsList = res.data;
      this.goosNewList = this.goodsList.filter(
        (item, index) => index < this.size
      );
      this.page = 1;
      this.isReachBottom = false;
      if (this.goodsList.length == this.goosNewList.length) {
        this.isReachBottom = true;
        return;
      }
    },
    options1Fn(idx, min, max) {
      this.index1 = idx;
      this.min = min;
      this.max = max;
      this.goodsSearch();
    },
    options2Fn(idx, type) {
      this.index2 = idx;
      this.type = type;
      this.goodsSearch();
    },
    // 滚动事件
    scrollFn() {
      if (getScrollTop() + getClientHeight() > getScrollHeight() - 240) {
        if (this.goodsList.length == this.goosNewList.length) {
          this.isReachBottom = true;
          return;
        }
        if (this.isLoading == false) {
          this.isLoading = true;
          console.log("开始准备加载下一页了...");
          this.page++;
          setTimeout(() => {
            for (
              let i = (this.page - 1) * this.size;
              i < this.page * this.size;
              i++
            ) {
              console.log("for:i", this.page, this.goodsList[i]);
              this.goodsList[i] && this.goosNewList.push(this.goodsList[i]);
            }
            this.isLoading = false;
          }, 500);
        }
      }
    },
  },
  watch: {
    "$route.query.keyword": {
      handler(newVal, oldVal) {
        this.keyword = newVal;
        this.goodsSearch();
      },
    },
  },
};
</script>
 
<style lang = "less" scoped>
@import "../assets/css/public.less";

.goods {
  padding-bottom: 50px;
  background: #efefef;
  padding-top: 20px;
  .options {
    padding-top: 20px;
    padding-bottom: 40px;
    li {
      margin-top: 20px;
      strong {
        color: #000;
        font-weight: bold;
      }
      span {
        margin-right: 20px;
        margin-left: 10px;
        cursor: pointer;
        color: #999;
        &.active {
          color: @base-color;
          font-weight: bold;
        }
      }
    }
  }
  .loadingIcon {
    text-align: center;
  }
  /* 旋转动画 */
  .rotateIcon {
    display: inline-block;
    animation: rotate 2s linear infinite;
  }
}
@keyframes rotate {
  0% {
    transform: rotateZ(0deg); /*从0度开始*/
  }
  100% {
    transform: rotateZ(360deg); /*360度结束*/
  }
}
</style>